改了部分代码，下载后报错。
mmc2: Card removed during transfer!
mmc2: Resetting controller.
mmc2: new high speed SDHC card at address 59b4
mmcblk2: mmc2:59b4 USD 14.1 GiB (ro)
mmc2: Card removed during transfer!
mmc2: Resetting controller.
mmcblk2: unknown error -123 sending read/write command, card status 0xb00
end_request: I/O error, dev mmcblk2, sector 0
Buffer I/O error on device mmcblk2, logical block 0
mmc2: Card removed during transfer!
mmc2: Resetting controller.
mmcblk2: unknown error -123 sending read/write command, card status 0xb00
end_request: I/O error, dev mmcblk2, sector 0
Buffer I/O error on device mmcblk2, logical block 0
mmcblk2: unable to read partition table
mmc2: Card removed during transfer!
mmc2: Resetting controller.
mmcblk2: unknown error -123 sending read/write command, card status 0xb00
end_request: I/O error, dev mmcblk2, sector 29685632
Buffer I/O error on device mmcblk2, logical block 3710704
mmc2: Card removed during transfer!
mmc2: Resetting controller.
mmcblk2: unknown error -123 sending read/write command, card status 0x80000b00
end_request: I/O error, dev mmcblk2, sector 29685632
Buffer I/O error on device mmcblk2, logical block 3710704
mmc2: Card removed during transfer!
mmc2: Resetting controller.
mmc2: Card removed during transfer!
mmc2: Resetting controller.
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